Rarity fashioned some jeans for Applejack, which she wore with a green shirt. Rainbow Dash came over to Sweet Apple Acres, and Applejack showed her her new jeans. Rainbow Dash challenged her to a cider-drinking contest, which Rainbow won at 26 ciders. After about an hour of hanging out, they both needed to pee.

"Ah challenge you to a holdin' contest," said Applejack.

"You're on!" said Rainbow Dash.

"Put on yer sports outfit," said Applejack. "That way, it'll be fair an' square." She blushed lightly.

Once Rainbow Dash was wearing her yellow shirt and skintight white shorts, the holding contest was on. Applejack hoped Rainbow Dash would be at a disadvantage since she drank one more cider than she did.

For about an hour, they held it in, both squirming and trying hard not to wet themselves.

Then Rainbow Dash let out a whimper. She wasn't sure how much longer she could hold it. Applejack took this to mean Rainbow Dash was wetting herself, and her heart began beating faster, thinking she'd won. But this took attention away from her bladder. "Damn it!" she said as she peed her jeans.

"Yeah! I win!" said Rainbow Dash. Of course she still had to go to the bathroom, and watching Applejack pee wasn't doing her much good, so she turned around to zip toward the bathroom at full speed. However, Applejack bit her tail and held her back.

"Let me go!" said Rainbow Dash. "I REALLY need to go!"

"Ah didn't go through all this to be the only pony to pee herself," said Applejack. She really wanted to see Rainbow Dash wet herself. Normally she'd never do this to any pony, but she was really disappointed at losing this contest, plus Rainbow Dash must have considered the possibility of it or else she'd never have engaged Applejack in such a contest.

Rainbow tried her hardest to pull herself free of Applejack, but in the end, she couldn't hold it any longer. For the second time, Rainbow Dash was peeing her shorts. She blushed, feeling embarrassed, but Applejack blushed more.

"Applejack!" said Rainbow Dash once she had finished peeing. "What the hay was that about?"

"Ah shucks, ah'm sorry sugarcube," said Applejack, still blushing. "Ah guess ah just got caught up in the moment."

"Aw, don't worry about it," said Rainbow Dash. "I guess it's only fair."

She hadn't realized it the first time, in light of Fluttershy's humiliation, but she suddenly realized, though she would hate to admit it to anyone else, that she secretly liked the feeling of wetting herself. She'd have to challenge Applejack to this contest again one day!

Author's Notes:

I did this because the idea has been thrown around for a while, but no one else seems to want to do it. Also, I've seen more than one fan depiction of Applejack being into this sort of thing.

Again, the last sentence was added in after my first chicken-out as part of a suggestion on my post in the My Little Fetish forum.